Deep 40 / Deep 40 Trimix

Course Overview

The Deep 40 and Deep 40 Trimix courses train certified divers to safely plan and conduct dives to 40 metres, focusing on the additional mental demands, risk management, and gas planning required for deep diving. Deep 40 covers air/nitrox dives, while Deep 40 Trimix introduces the use of trimix (up to 20% helium) for added safety and reduced narcosis. Both courses combine theory, gas planning, and four open-water dives under direct instructor supervision.

Quality over Quantity — the focus is on safe, correct procedures, disciplined gas management, and hands-on practice. You will demonstrate competence in all required skills before certification.

Course Details

  • Course Name: Deep 40 / Deep 40 Trimix
  • Course Level: Advanced Specialty (Deep Diving)
  • Min. Age: Deep 40: 15 years; Deep 40 Trimix: 18 years
  • Duration: 2 days
  • Max Depth: 40 m / 130 ft
  • Setting: Open Water
  • Price: XXX

What You Will Learn

  • Deep dive planning and organization up to 40 m
  • Gas management for deep dives (air, nitrox, and trimix up to 20% He)
  • Problem and hazard management at depth
  • Managing the mental demands and stress factors of deeper diving
  • Emergency procedures and rescue considerations for deep dives
  • Trimix workshop (for Deep 40 Trimix): gas selection, analyzing, and proper labeling

Logistics & Prerequisites

Included:

  • Digital learning materials (Deep 40 and/or Deep 40 Trimix module)
  • Four open-water dives
  • Certification (eCard) after passing
  • Necessary special equipment for deep/trimix dives

Not Included:

  • Rental base equipment — All rental gear is not included in the price
  • Gases (air, nitrox, trimix) and fills

Requirements:

  • Deep 40:
    • Min age: 15 years
    • Certification: Open Water 20 or equivalent
    • Logged experience: 8 hours open water
  • Deep 40 Trimix:
    • Min age: 18 years
    • Certification: Open Water 20 + Nitrox or equivalent
    • Logged experience: 8 hours open water
  • Medical: Fit for diving, medical questionnaire completed
  • Registration: Complete online registration and documentation before practical session

Training Schedule

  1. Theory: Complete e-learning module and quiz (Deep 40 and/or Trimix)
  2. Gas Workshop: (Trimix only) Gas selection, analysis, and labeling
  3. Open Water: Four open-water dives
  4. Assessment: Demonstrate all required skills and pass the final knowledge review

Notes:

  • Instructor/student ratio: 1:2
  • Certification is awarded upon successful demonstration of all skills and knowledge
  • Deep 40 is a prerequisite for further technical training (TEC40, TEC DEEP, TEC Sidemount)

Pro Tip / Note

Deep diving requires discipline and clear thinking. Always double-check your gas, plan your ascent, and never exceed your personal limits. For trimix, analyze every mix and label your cylinders clearly.